Option Strict On Public Class UserControl1 Inherits System.Windows.Forms.TextBox '.UserControl #Region " Windows Form Designer generated code " Public Sub New() MyBase.New() 'This call is required by the Windows Form Designer. InitializeComponent() 'Add any initialization after the InitializeComponent() call End Sub 'UserControl1 overrides dispose to clean up the component list. Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub 'Required by the Windows Form Designer Private components As System.ComponentModel.IContainer 'NOTE: The following procedure is required by the Windows Form Designer 'It can be modified using the Windows Form Designer. 'Do not modify it using the code editor. <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() components = New System.ComponentModel.Container End Sub #End Region Protected Overrides Sub OnTextChanged(ByVal e As System.EventArgs) If Me.Text.Length = 0 Then If Me.DesignMode Then Me.Text = Me.Name End If End If End Sub End ClassBuild your control library.
Friend WithEvents TextBox2 As WindowsControlLibrary2.UserControl1 ' System.Windows.Forms.TextBoxIt should work as expected.